<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        #result
        {
            width: 200px;
            height: 100px;
            border: solid 1px #258;
        }
    </style>
    <script type="text/javascript">
        window.onload=function()
        {
            const btn=document.getElementById("btn");
            const result=document.getElementById("result");
            btn.onclick=function()
            {
                //console.log("test");
                const xhr=new XMLHttpRequest();
                xhr.open("GET","http://127.0.0.1:8000/ie");
                xhr.send();
                xhr.onreadystatechange=function()
                {
                    if(xhr.readyState===4)
                    {
                        if(xhr.status>=200&&xhr.status<300)
                        {
                            result.innerHTML=xhr.response;
                        }
                    }
                };
            };
        };
    </script>
</head>
<body>
    <button id="btn">点击发送请求</button>
    <div id="result"></div>
</body>
</html>